CODEWITHSUNDEEP
c#for-loopwhile-loop
alabasi
alabasi

Reputation: 81

how can I draw a triangle of asterisks using the while statement?

here is the (not working code) and it should print the shape below but its not :

static void Main(string[] args)
{
    int i = 1;
    int k = 5;
    int h = 1;

    while (i <= 5)
    {
        Console.WriteLine("");
        while (k > i)
        {
            Console.Write(" ");
            k--;
        }
        while (h <= i)
        {
            Console.Write("**");
            h++;
        }
        i++;
    }
    Console.ReadLine();

}

Screenshot

but when I try to do the same using the while statement the shape gets totally messed up.

any help ?

Upvotes: 0

Views: 11257

Answers (5)

Raymond Reddington
Raymond Reddington

Reputation: 1837

Actually I've done this via 'for' loop, z is height and x is equal to length of side.

Isosceles triangle (x>z):

 public void Print(int x, int z)
        {
            var peakStart = x;
            var peakEnd = x;

            for (int i = 0; i < z; i++)
            {
                for (int j = 0; j < 2 * x + 1; j++)
                {
                    if (peakStart < 1.5 * x && j >= peakStart && j <= peakEnd)
                        Console.Write("*");
                    else
                        Console.Write(" ");
                }
                peakStart--;
                peakEnd++;
                Console.WriteLine("");
            }
        }

Upvotes: 0

Javed Akram
Javed Akram

Reputation: 15344

I'll not solve for you just will give you hint only: Use 3 loop statements

1. for line change
2. for spaces (reverse loop)
3. for printing * (odd series in this case) i.e. 2n-1

check in third while statement h <= 2*i - 1; and print only one * in place of **

Check here: http://ideone.com/xOB2OI

Upvotes: 0

AdrianHHH
AdrianHHH

Reputation: 14038

The problem is that i, k and h are initialised before the outermost loop is entered. Within the outer loop k and h are altered by the inner loops. On the second execution of the outer loop k and h have the same values as were left after running the inner loops previously. As i increments in the outer loop, the k loop will not be entered and the h loop will only run once.

Think about what values h and k should have inside the outermost loop on the second execution.

Upvotes: 0

mrahhal
mrahhal

Reputation: 3497

int NumberOfLines = 5;
int count = 1;
while (NumberOfLines-- != 0)
{
    int c = count;
    while (c-- != 0)
    {
        Console.Write("*");
    }
    Console.WriteLine();
    count = count + 2;
}

That's it, simplest implementation.

Upvotes: 2

MarcinJuraszek
MarcinJuraszek

Reputation: 125610

You have to declare k and h within the loop:

static void Main(string[] args)
{
    int i = 1;
    while (i <= 5)
    {
        int k = 5;
        int h = 1;

        Console.WriteLine("");
        while (k > i)
        {
            Console.Write(" ");
            k--;
        }
        while (h <= i)
        {
            Console.Write("**");
            h++;
        }
        i++;
    }
    Console.ReadLine();
}

With your current solution, after first outer loop iteration, inner loops do nothing.

Upvotes: 2

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